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UC3842A Datasheet(PDF) 4 Page - ON Semiconductor

Part No. UC3842A
Description  High Performance Current Mode Controllers
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Maker  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

UC3842A Datasheet(HTML) 4 Page - ON Semiconductor

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UC3842A, UC3843A, UC2842A, UC2843A
http://onsemi.com
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ELECTRICAL CHARACTERISTICS (VCC = 15 V, [Note 4], RT = 10 k, CT = 3.3 nF, TA = Tlow to Thigh [Note 5],
unless otherwise noted.)
UC284XA
UC384XA
Characteristics
Symbol
Min
Typ
Max
Min
Typ
Max
Unit
CURRENT SENSE SECTION
Current Sense Input Voltage Gain (Notes 6 & 7)
AV
2.85
3.0
3.15
2.85
3.0
3.15
V/V
Maximum Current Sense Input Threshold (Note 6)
Vth
0.9
1.0
1.1
0.9
1.0
1.1
V
Power Supply Rejection Ratio
VCC = 12 to 25 V (Note 6)
PSRR
70
70
dB
Input Bias Current
IIB
−2.0
−10
−2.0
−10
mA
Propagation Delay (Current Sense Input to Output)
tPLH(in/out)
150
300
150
300
ns
OUTPUT SECTION
Output Voltage
Low State (ISink = 20 mA)
Low State (ISink = 200 mA)
High State (ISink = 20 mA)
High State (ISink = 200 mA)
VOL
VOH
13
12
0.1
1.6
13.5
13.4
0.4
2.2
13
12
0.1
1.6
13.5
13.4
0.4
2.2
V
Output Voltage with UVLO Activated
VCC = 6.0 V, ISink = 1.0 mA
VOL(UVLO)
0.1
1.1
0.1
1.1
V
Output Voltage Rise Time (CL = 1.0 nF, TJ = 25°C)
tr
50
150
50
150
ns
Output Voltage Fall Time (CL = 1.0 nF, TJ = 25°C)
tf
50
150
50
150
ns
UNDERVOLTAGE LOCKOUT SECTION
Startup Threshold
UCX842A
UCX843A
Vth
15
7.8
16
8.4
17
9.0
14.5
7.8
16
8.4
17.5
9.0
V
Minimum Operating Voltage After Turn−On
UCX842A
UCX843A
VCC(min)
9.0
7.0
10
7.6
11
8.2
8.5
7.0
10
7.6
11.5
8.2
V
PWM SECTION
Duty Cycle
Maximum
Minimum
DCmax
DCmin
94
96
0
94
96
0
%
TOTAL DEVICE
Power Supply Current (Note 4)
Startup:
(VCC = 6.5 V for UCX843A,
(VCC = 14 V for UCX842A) Operating
ICC
0.5
12
1.0
17
0.5
12
1.0
17
mA
Power Supply Zener Voltage (ICC = 25 mA)
VZ
30
36
30
36
V
4. Adjust VCC above the Startup threshold before setting to 15 V.
5. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient as possible.
Tlow =0°C for UC3842A, UC3843A
Thigh = +70°C for UC3842A, UC3843A
−25
°C for UC2842A, UC2843A
+85
°C for UC2842A, UC2843A
6. This parameter is measured at the latch trip point with VFB = 0 V.
7. Comparator gain is defined as: AV
DV Output Compensation
DV Current Sense Input


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